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| The residue and release pattern of organochlorine pesticides in sediments and paddy soils in the Qingshitan reservoir region in Guilin, China |
| Received:October 26, 2018 |
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| KeyWord:organochlorine pesticide;sediment;paddy soil;release;Qingshitan reservoir |
| Author Name | Affiliation | E-mail | | LIANG Yan-peng | College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, China
Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin 541004, China
Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area, Guilin University of Technology, Guilin 541004, China | | | FU Xin | College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, China | | | ZENG Hong-hu | College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, China
Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin 541004, China
Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area, Guilin University of Technology, Guilin 541004, China | zenghonghu@glut.edu.cn | | QIN Li-tang | College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, China
Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin 541004, China
Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area, Guilin University of Technology, Guilin 541004, China | | | MO Ling-yun | Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin 541004, China
Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area, Guilin University of Technology, Guilin 541004, China | |
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| Abstract: |
| In order to understand the residues and release characteristics of organochlorine pesticides (OCPs) in sediments and soils in the Qingshitan reservoir region, the concentrations of OCPs in the sediments of reservoir, pond, river and paddy soils are determined by a gas chromatography-election capture detector (GC-ECD). Under static and suspended conditions, the release patterns of OCPs in sediments and paddy soils are investigated using an indoor simulation device. The results show that the residues of OCPs in the sediments of reservoir, pond, river and paddy soils are 81.55, 88.60, 68.96 ng·g-1 and 92.62 ng·g-1(dry weight), respectively. Among all the OCPs, the concentrations of DDTs and HCHs are found to be at higher levels, being 23.26~39.89 ng·g-1 and 12.22~17.20 ng·g-1, respectively. When the overlying water is ultrapure water, the OCPs initially release quickly and then slowly in the static group and suspended group. The concentration of OCPs in the suspended group is found to be significantly higher than that in the static group. The release of HCHs and β-endosulfan is the highest. The physical and chemical properties of OCPs, substrate compositions and external disturbance results in significant differences in the detection rate and concentration of OCPs in the overlying water. The release rate of OCPs from paddy soils to overlying water is the highest, while the river sediments show the lowest release rate. Sodium dodecyl sulfate (SDS) can help OCPs in the substrate release into the overlying water quickly, especially for the DDTs. Under static and suspended conditions, the concentrations of OCPs in the overlying water increase by 134.44% and 118.41%, respectively. Therefore, both external disturbance and sodium dodecyl sulfate can promote the release of OCPs from the substrate to overlying water. |
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